Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 5 - Thermochemistry - Exercises - Page 206: 5.53b

Answer

Increasing the temperature of 1 mol of octane requires more energy.

Work Step by Step

Octane is 2.22 J/g*K. First we need to convert it to the molar heat capacity so we need to find the molar mass. Octane is C8H18. C is 12g/mol and H is 18g/mol so we have: 12*8 = 96 18*1 = 18 Molar mass of C8H18 = 114 g/mol Then we convert the heat capacity as follows: 2.22 J/g*K * 114g/mol = 253.08 J/mol*K For water, the specific heat is 4.18 J/g*K Water is H2O so we find the molar mass. H is 1 g/mol and O is 16g/mol so H2O is 18 g/mol. The molar heat capaity is then: 4.18 J/g*K * 18g/mol = 75.24 J/mol * K Since the molar heat capacity of octane is higher, it requires more energy to raise 1 mole by 1K
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.